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Note Borrowings (Maximum aggregate balance of federal funds purchased and repurchase agreements) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Debt Disclosure [Abstract] |  |
Maximum aggregate balance outstanding at any month-end | $ 401,606 | $ 471,083
Average montly aggregate balance outstanding | $ 330,585 | $ 399,422
Weighted average interest rate for the year | 2.01% | 1.22%
Weighted average interest rate at December 31 | 2.44% | 1.50%

X
- Definition Reflects the calculation of the average interest rate weighted by the amount of fed funds purchased and assets sold under agreements to reurchase outstanding at that time. + References No definition available. + Details
Name: | bpop_FedFundAssetsSoldWeightedAverageInterestRateDecember
Namespace Prefix: | bpop_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Reflects the calculation of the average interest rate weighted by the amount of fed funds purchased and assets sold under agreements to reurchase outstanding during the year. + References No definition available. + Details
Name: | bpop_FedFundAssetsSoldWeightedAverageInterestRateForYear
Namespace Prefix: | bpop_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition For federal funds purchased and assets sold under agreements to repurchase, maximum month-end borrowings during the period. + References No definition available. + Details
Name: | bpop_FedFundsAssetSoldMaximumAggregateBalanceOutstandingMonthEnd
Namespace Prefix: | bpop_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition For federal funds purchased and assets sold under agreements to repurchase, average borrowings during the period. + References No definition available. + Details
Name: | bpop_FedFundsAssetsSoldAverageMonthlyAggregateBalanceOutstanding
Namespace Prefix: | bpop_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration